共查询到18条相似文献,搜索用时 328 毫秒
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高掺镁LiNbO3晶体折射率温度系数的表示式 总被引:2,自引:0,他引:2
推导了掺5mol%MgO的LiNbO3晶体折射率温度系数的表示式。利用这些表示式可以计算293~428K温度和0.5398μm~1.3414μm波长范围内的折射率温度系度,结果表明:计算值和实验值的最大相对偏差是12%,用具有最大相对偏差的折射率温度系数的计算值,计算1.0795μm波长的非临界相位匹配温度,其值为382.4K,它与实验值仅差6K。因此,本文得到的表示式,对于采用这种晶体,设计在上 相似文献
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高掺镁铌酸钾晶体的主折射率及其温度系数的测量 总被引:1,自引:0,他引:1
本文报道掺5mol%MgO的铌酸锂(liNbO_3)晶体的主折射率n_o、n_o及其温度系数.用自准直法在0.5398μm、0.6328μm、1.0795μm和1.3414μm波长上,并在20℃~160℃温度范周内,测量了该晶体的主折射率,并获得在这些波长上的折射率温度系数.修正的Sellmeier方程的常数也在20℃~160℃温度内推算出.用此结果计算室温的二次谐波I类临界相位匹配角与实验值符合得很好,又计算二次谐波的非临界相位匹配温度,其结果也与实验值较符合. 相似文献
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用最小偏向角法在20℃下精确测量了0.62Pb(Mg1/3Nb2/3)O3-0.38PbTiO3(0.62PMN-0.38PT)单晶的折射率,给出了该温度下折射率色散的Sellmeier方程.研究了能带结构与折射率的关系,计算了样品的Sellmeier光学系数:对no,E0=5.50eV,λ0=0.226μm,S0=1.004×1014m-2,Ed=28.10eV;对ne,E0=5.57eV,λ0=0.223μm,S0=1.017×1014m-2,Ed=28.10eV.ABO3型钙钛矿材料中,BO6八面体基元决定了晶体的能带结构,对折射率产生重要影响. 相似文献
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本文在获得精确的 7.5mol% Nb∶ KTP晶体的 Sellmeier主折射率色散方程的基础上 ,计算 7.5mol% Nb∶ KTP晶体对 1 .0 6 42μm和 1 .3 1 88μm Nd∶ YAG激光的倍频和和频的 型相位匹配曲线 .通过研究 KTP和 7.5mol% Nb∶ KTP晶体的主折射率 ,双折射率和相位匹配 ,可以看出 Nb掺入 KTP晶体后产生的折射率和双折射率的色散和各向异型的变化是引起 KTP晶体相位变化的根本原因 . 相似文献
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采用调Q Nd:YAG激光倍频光(0.532μm)泵浦温度调谐MgO:LiNbO_3晶体单、双谐振光参量振荡器(OPO包括DRO、SRO)的实验结果.双谐振(DRO)调谐范围达844.1~1411.3nm,最低泵浦阈值0.22mJ/pulse;单谐振(SRO)调谐范围达738.9~1032.2nm,最低泵浦阈值0.66mJ/pulse.最大能量转换效率为10.4%. 相似文献
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本文在文献[1]的基础上提出了含有椭圆折射率分布介质谐振腔的设计方法。分析了b轴Nd+CrNd:YAP连续激光器中热效应对激光横向场分布,输出偏振方向以及输出功率的影响。考虑了这种影响后,已从φ5.8×111mm的Nd:YAP棒和φ6.4×100mm的Nd+Cr:YAP棒中得到了163W和152W的输出,器件效率分别为2.26%和2.11%,输出激光的退偏度为1/2900
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J. Šonský J. Lančok M. Jelínek J. Oswald V. Studnička 《Applied Physics A: Materials Science & Processing》1998,66(5):583-586
3 (YAP) thin films as a promising material for application in a planar waveguide laser has been studied. The films have been
grown on sapphire(0001) and YAP(001) substrates by laser ablation. The influence of the substrate temperature and ambient
oxygen pressure on the crystalline structure, concentration of Nd incorporated into films, and consequent luminescence spectra
were investigated. The waveguiding properties were observed and refractive index of the films was evaluated.
Received: 8 February 1998/Accepted: 9 February 1998 相似文献
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石英晶体的色散方程及折射率温度系数 总被引:2,自引:3,他引:2
研究了石英晶体在不同温度下折射率随波长的变化规律.通过对Sellmeier方程严格求解,得出了其系数表达式,计算出了不同波长对应的折射率,经验证与实验值符合得很好.通过曲线拟合求解出了折射率温度系数表达式,由此式可计算出不同波长折射率温度系数;进一步求解出了Sellmeier方程常量随温度变化地数值,得到求解不同温度任意波长的石英晶体主折射率的一种方法. 相似文献
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We demonstrate longitudinally diode-pumped operation of Nd:YAG and Nd:YAP lasers at the long-wavelength end of the (4)F(3/2) ? (4)I(13/2) transition in the eye-safe spectral region at 1444 and 1430 nm, respectively. Special crystal coatings were required for achievement of lasing at these wavelengths. Output powers of up to 4.9 and 2.2 W, with slope efficiencies of up to 22% and 8%, respectively, were achieved. Polarized operation of the Nd:YAG laser yielded output powers of 76% as compared with unpolarized operation. Because of thermal stress, both YAG and YAP crystals were fractured at roughly 25 W of absorbed longitudinal pump power. 相似文献
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H.J. Eichler 《Optics Communications》1983,45(1):62-66
A cw Nd: YAG-laser beam partially absorbed in a Si-crystal, produces refractive index changes. With an incident power of up to 3 W focussed to 150 μm spot radius, the optical cavity formed by the two surfaces of the crystal (thickness 500 μm) is tuned over four resonances. The transmitted power shows a steplike multi-stable behaviour. Free carrier production and thermal index changes are discussed as mechanisms. 相似文献
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Liang Liu Author Vitae Xiaobo Wang Author VitaeAuthor Vitae Xiaojun Xu Author VitaeAuthor Vitae 《Optics Communications》2011,284(5):1274-1277
The expressions of focal length in side-pumped rod lasers are studied. Good agreement is obtained between simulation and experiments reported previously, using Koechner's theory. The results reveal that underestimation of thermal lens accrues from overestimating the material's thermal conduction and without considering the nonuniform heat deposit. In the case of Nd:YAG rods, temperature-dependent variation of the refractive index constitutes the major contribution of thermal lensing, whereas the temperature- and stress-dependent variations of the refractive index make the major contributions of thermal lensing for Nd:Glass rod lasers. 相似文献
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Gansheng Li Jinhua Wu Ying Chen Jinfeng Chen Zhenzhu Shi Chunming Xiao 《Chinese Journal of Lasers》1993,2(1):91-96
The effect of melt pretreatment of Ce~(3 ): YAP and (Ce~(3 ) Nd~(3 )): YAP and their growth ambient gases on the quality of the crystals are described. Firstly, a superheating pretreatment of YAP melt is adopted in a nitrogen atmosphere containing a little oxygen to eliminate carbon; then the YAP melt is superheated in a reduction atmosphere to fully reduce Ce~(4 ) ions into Ce~(3 ) ions in the melt. Finally, in a growth atmosphere of pure nitrogen, high quality Ce~(3 ): YAP and (Ce~(3 ) Nd~(3 )): YAP single crystals with high Ce~(3 ) concentration with only few light scattering centers were grown. 相似文献